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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1723b8e521495001146543dabd2f5ff58e7b61d067f5fb0c5b86a7a028738bb' 
  AND token = 'EfiHNVfEux2m2o6E3abap7Aynab1Jg3D0m+jzPT6aVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}